#include <stdlib.h>
#include <stdio.h>
#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include "util.h"
+#include "ui.h"
+#include "iso14443crc.h"
+#include "parity.h"
+#include "protocols.h"
+#include "crapto1/crapto1.h"
+#include "mifarehost.h"
+#include "mifaredefault.h"
+enum MifareAuthSeq {
+ masNone,
+ masNt,
+ masNrAr,
+ masAt,
+ masAuthComplete,
+ masFirstData,
+ masData,
+ masError,
+};
+static enum MifareAuthSeq MifareAuthState;
+static TAuthData AuthData;
+
+void ClearAuthData() {
+ AuthData.uid = 0;
+ AuthData.nt = 0;
+ AuthData.first_auth = true;
+ AuthData.ks2 = 0;
+ AuthData.ks3 = 0;
+}
+
+/**
+ * @brief iso14443A_CRC_check Checks CRC in command or response
+ * @param isResponse
+ * @param data
+ * @param len
+ * @return 0 : CRC-command, CRC not ok
+ * 1 : CRC-command, CRC ok
+ * 2 : Not crc-command
+ */
+uint8_t iso14443A_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
+{
+ uint8_t b1,b2;
+
+ if(len <= 2) return 2;
+
+ if(isResponse & (len < 6)) return 2;
+
+ ComputeCrc14443(CRC_14443_A, data, len-2, &b1, &b2);
+ if (b1 != data[len-2] || b2 != data[len-1]) {
+ return 0;
+ } else {
+ return 1;
+ }
+}
+
+uint8_t mifare_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
+{
+ switch(MifareAuthState) {
+ case masNone:
+ case masError:
+ return iso14443A_CRC_check(isResponse, data, len);
+ default:
+ return 2;
+ }
+}
+
+void annotateIclass(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
+{
+ switch(cmd[0])
+ {
+ case ICLASS_CMD_ACTALL: snprintf(exp,size,"ACTALL"); break;
+ case ICLASS_CMD_READ_OR_IDENTIFY:{
+ if(cmdsize > 1){
+ snprintf(exp,size,"READ(%d)",cmd[1]);
+ }else{
+ snprintf(exp,size,"IDENTIFY");
+ }
+ break;
+ }
+ case ICLASS_CMD_SELECT: snprintf(exp,size,"SELECT"); break;
+ case ICLASS_CMD_PAGESEL: snprintf(exp,size,"PAGESEL(%d)", cmd[1]); break;
+ case ICLASS_CMD_READCHECK_KC:snprintf(exp,size,"READCHECK[Kc](%d)", cmd[1]); break;
+ case ICLASS_CMD_READCHECK_KD:snprintf(exp,size,"READCHECK[Kd](%d)", cmd[1]); break;
+ case ICLASS_CMD_CHECK: snprintf(exp,size,"CHECK"); break;
+ case ICLASS_CMD_DETECT: snprintf(exp,size,"DETECT"); break;
+ case ICLASS_CMD_HALT: snprintf(exp,size,"HALT"); break;
+ case ICLASS_CMD_UPDATE: snprintf(exp,size,"UPDATE(%d)",cmd[1]); break;
+ case ICLASS_CMD_ACT: snprintf(exp,size,"ACT"); break;
+ case ICLASS_CMD_READ4: snprintf(exp,size,"READ4(%d)",cmd[1]); break;
+ default: snprintf(exp,size,"?"); break;
+ }
+ return;
+}
+
+void annotateIso15693(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
+{
+
+ if(cmd[0] == 0x26)
+ {
+ switch(cmd[1]){
+ case ISO15693_INVENTORY :snprintf(exp, size, "INVENTORY");break;
+ case ISO15693_STAYQUIET :snprintf(exp, size, "STAY_QUIET");break;
+ default: snprintf(exp,size,"?"); break;
+
+ }
+ }else if(cmd[0] == 0x02)
+ {
+ switch(cmd[1])
+ {
+ case ISO15693_READBLOCK :snprintf(exp, size, "READBLOCK");break;
+ case ISO15693_WRITEBLOCK :snprintf(exp, size, "WRITEBLOCK");break;
+ case ISO15693_LOCKBLOCK :snprintf(exp, size, "LOCKBLOCK");break;
+ case ISO15693_READ_MULTI_BLOCK :snprintf(exp, size, "READ_MULTI_BLOCK");break;
+ case ISO15693_SELECT :snprintf(exp, size, "SELECT");break;
+ case ISO15693_RESET_TO_READY :snprintf(exp, size, "RESET_TO_READY");break;
+ case ISO15693_WRITE_AFI :snprintf(exp, size, "WRITE_AFI");break;
+ case ISO15693_LOCK_AFI :snprintf(exp, size, "LOCK_AFI");break;
+ case ISO15693_WRITE_DSFID :snprintf(exp, size, "WRITE_DSFID");break;
+ case ISO15693_LOCK_DSFID :snprintf(exp, size, "LOCK_DSFID");break;
+ case ISO15693_GET_SYSTEM_INFO :snprintf(exp, size, "GET_SYSTEM_INFO");break;
+ case ISO15693_READ_MULTI_SECSTATUS :snprintf(exp, size, "READ_MULTI_SECSTATUS");break;
+ default: snprintf(exp,size,"?"); break;
+ }
+ }
+}
+
+
+void annotateTopaz(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
+{
+ switch(cmd[0]) {
+ case TOPAZ_REQA :snprintf(exp, size, "REQA");break;
+ case TOPAZ_WUPA :snprintf(exp, size, "WUPA");break;
+ case TOPAZ_RID :snprintf(exp, size, "RID");break;
+ case TOPAZ_RALL :snprintf(exp, size, "RALL");break;
+ case TOPAZ_READ :snprintf(exp, size, "READ");break;
+ case TOPAZ_WRITE_E :snprintf(exp, size, "WRITE-E");break;
+ case TOPAZ_WRITE_NE :snprintf(exp, size, "WRITE-NE");break;
+ case TOPAZ_RSEG :snprintf(exp, size, "RSEG");break;
+ case TOPAZ_READ8 :snprintf(exp, size, "READ8");break;
+ case TOPAZ_WRITE_E8 :snprintf(exp, size, "WRITE-E8");break;
+ case TOPAZ_WRITE_NE8 :snprintf(exp, size, "WRITE-NE8");break;
+ default: snprintf(exp,size,"?"); break;
+ }
+}
+
+
+/**
+06 00 = INITIATE
+0E xx = SELECT ID (xx = Chip-ID)
+0B = Get UID
+08 yy = Read Block (yy = block number)
+09 yy dd dd dd dd = Write Block (yy = block number; dd dd dd dd = data to be written)
+0C = Reset to Inventory
+0F = Completion
+0A 11 22 33 44 55 66 = Authenticate (11 22 33 44 55 66 = data to authenticate)
+**/
+
+void annotateIso14443b(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
+{
+ switch(cmd[0]){
+ case ISO14443B_REQB : snprintf(exp,size,"REQB");break;
+ case ISO14443B_ATTRIB : snprintf(exp,size,"ATTRIB");break;
+ case ISO14443B_HALT : snprintf(exp,size,"HALT");break;
+ case ISO14443B_INITIATE : snprintf(exp,size,"INITIATE");break;
+ case ISO14443B_SELECT : snprintf(exp,size,"SELECT(%d)",cmd[1]);break;
+ case ISO14443B_GET_UID : snprintf(exp,size,"GET UID");break;
+ case ISO14443B_READ_BLK : snprintf(exp,size,"READ_BLK(%d)", cmd[1]);break;
+ case ISO14443B_WRITE_BLK : snprintf(exp,size,"WRITE_BLK(%d)",cmd[1]);break;
+ case ISO14443B_RESET : snprintf(exp,size,"RESET");break;
+ case ISO14443B_COMPLETION : snprintf(exp,size,"COMPLETION");break;
+ case ISO14443B_AUTHENTICATE : snprintf(exp,size,"AUTHENTICATE");break;
+ default : snprintf(exp,size ,"?");break;
+ }
+
+}
+
+void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
+{
+ switch(cmd[0])
+ {
+ case ISO14443A_CMD_WUPA:
+ snprintf(exp,size,"WUPA");
+ break;
+ case ISO14443A_CMD_ANTICOLL_OR_SELECT:{
+ // 93 20 = Anticollision (usage: 9320 - answer: 4bytes UID+1byte UID-bytes-xor)
+ // 93 70 = Select (usage: 9370+5bytes 9320 answer - answer: 1byte SAK)
+ if(cmd[1] == 0x70)
+ {
+ snprintf(exp,size,"SELECT_UID"); break;
+ }else
+ {
+ snprintf(exp,size,"ANTICOLL"); break;
+ }
+ }
+ case ISO14443A_CMD_ANTICOLL_OR_SELECT_2:{
+ //95 20 = Anticollision of cascade level2
+ //95 70 = Select of cascade level2
+ if(cmd[2] == 0x70)
+ {
+ snprintf(exp,size,"SELECT_UID-2"); break;
+ }else
+ {
+ snprintf(exp,size,"ANTICOLL-2"); break;
+ }
+ }
+ case ISO14443A_CMD_REQA:
+ snprintf(exp,size,"REQA");
+ break;
+ case ISO14443A_CMD_READBLOCK: snprintf(exp,size,"READBLOCK(%d)",cmd[1]); break;
+ case ISO14443A_CMD_WRITEBLOCK: snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); break;
+ case ISO14443A_CMD_HALT:
+ snprintf(exp,size,"HALT");
+ MifareAuthState = masNone;
+ break;
+ case ISO14443A_CMD_RATS: snprintf(exp,size,"RATS"); break;
+ case MIFARE_CMD_INC: snprintf(exp,size,"INC(%d)",cmd[1]); break;
+ case MIFARE_CMD_DEC: snprintf(exp,size,"DEC(%d)",cmd[1]); break;
+ case MIFARE_CMD_RESTORE: snprintf(exp,size,"RESTORE(%d)",cmd[1]); break;
+ case MIFARE_CMD_TRANSFER: snprintf(exp,size,"TRANSFER(%d)",cmd[1]); break;
+ case MIFARE_AUTH_KEYA:
+ if ( cmdsize > 3) {
+ snprintf(exp,size,"AUTH-A(%d)",cmd[1]);
+ MifareAuthState = masNt;
+ } else {
+ // case MIFARE_ULEV1_VERSION : both 0x60.
+ snprintf(exp,size,"EV1 VERSION");
+ }
+ break;
+ case MIFARE_AUTH_KEYB:
+ MifareAuthState = masNt;
+ snprintf(exp,size,"AUTH-B(%d)",cmd[1]);
+ break;
+ case MIFARE_MAGICWUPC1: snprintf(exp,size,"MAGIC WUPC1"); break;
+ case MIFARE_MAGICWUPC2: snprintf(exp,size,"MAGIC WUPC2"); break;
+ case MIFARE_MAGICWIPEC: snprintf(exp,size,"MAGIC WIPEC"); break;
+ case MIFARE_ULC_AUTH_1: snprintf(exp,size,"AUTH "); break;
+ case MIFARE_ULC_AUTH_2: snprintf(exp,size,"AUTH_ANSW"); break;
+ case MIFARE_ULEV1_AUTH:
+ if ( cmdsize == 7 )
+ snprintf(exp,size,"PWD-AUTH KEY: 0x%02x%02x%02x%02x", cmd[1], cmd[2], cmd[3], cmd[4] );
+ else
+ snprintf(exp,size,"PWD-AUTH");
+ break;
+ case MIFARE_ULEV1_FASTREAD:{
+ if ( cmdsize >=3 && cmd[2] <= 0xE6)
+ snprintf(exp,size,"READ RANGE (%d-%d)",cmd[1],cmd[2]);
+ else
+ snprintf(exp,size,"?");
+ break;
+ }
+ case MIFARE_ULC_WRITE:{
+ if ( cmd[1] < 0x21 )
+ snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]);
+ else
+ snprintf(exp,size,"?");
+ break;
+ }
+ case MIFARE_ULEV1_READ_CNT:{
+ if ( cmd[1] < 5 )
+ snprintf(exp,size,"READ CNT(%d)",cmd[1]);
+ else
+ snprintf(exp,size,"?");
+ break;
+ }
+ case MIFARE_ULEV1_INCR_CNT:{
+ if ( cmd[1] < 5 )
+ snprintf(exp,size,"INCR(%d)",cmd[1]);
+ else
+ snprintf(exp,size,"?");
+ break;
+ }
+ case MIFARE_ULEV1_READSIG: snprintf(exp,size,"READ_SIG"); break;
+ case MIFARE_ULEV1_CHECKTEAR: snprintf(exp,size,"CHK_TEARING(%d)",cmd[1]); break;
+ case MIFARE_ULEV1_VCSL: snprintf(exp,size,"VCSL"); break;
+ default: snprintf(exp,size,"?"); break;
+ }
+ return;
+}
+
+void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
+ if (!isResponse && cmdsize == 1) {
+ switch(cmd[0]) {
+ case ISO14443A_CMD_WUPA:
+ case ISO14443A_CMD_REQA:
+ MifareAuthState = masNone;
+ break;
+ default:
+ break;
+ }
+ }
+
+ // get UID
+ if (MifareAuthState == masNone) {
+ if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
+ ClearAuthData();
+ AuthData.uid = bytes_to_num(&cmd[2], 4);
+ }
+ if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
+ ClearAuthData();
+ AuthData.uid = bytes_to_num(&cmd[2], 4);
+ }
+ }
+
+ switch(MifareAuthState) {
+ case masNt:
+ if (cmdsize == 4 && isResponse) {
+ snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
+ MifareAuthState = masNrAr;
+ if (AuthData.first_auth) {
+ AuthData.nt = bytes_to_num(cmd, 4);
+ } else {
+ AuthData.nt_enc = bytes_to_num(cmd, 4);
+ AuthData.nt_enc_par = parity[0];
+ }
+ return;
+ } else {
+ MifareAuthState = masError;
+ }
+ break;
+ case masNrAr:
+ if (cmdsize == 8 && !isResponse) {
+ snprintf(exp,size,"AUTH: nr ar (enc)");
+ MifareAuthState = masAt;
+ AuthData.nr_enc = bytes_to_num(cmd, 4);
+ AuthData.ar_enc = bytes_to_num(&cmd[4], 4);
+ AuthData.ar_enc_par = parity[0] << 4;
+ return;
+ } else {
+ MifareAuthState = masError;
+ }
+ break;
+ case masAt:
+ if (cmdsize == 4 && isResponse) {
+ snprintf(exp,size,"AUTH: at (enc)");
+ MifareAuthState = masAuthComplete;
+ AuthData.at_enc = bytes_to_num(cmd, 4);
+ AuthData.at_enc_par = parity[0];
+ return;
+ } else {
+ MifareAuthState = masError;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (!isResponse && ((MifareAuthState == masNone) || (MifareAuthState == masError)))
+ annotateIso14443a(exp, size, cmd, cmdsize);
+
+}
+
+bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, uint8_t *parity, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
+ static struct Crypto1State *traceCrypto1;
+ static uint64_t mfLastKey;
+
+ *mfDataLen = 0;
+
+ if (MifareAuthState == masAuthComplete) {
+ if (traceCrypto1) {
+ crypto1_destroy(traceCrypto1);
+ traceCrypto1 = NULL;
+ }
+
+ MifareAuthState = masFirstData;
+ return false;
+ }
+
+ if (cmdsize > 32)
+ return false;
+
+ if (MifareAuthState == masFirstData) {
+ if (AuthData.first_auth) {
+ AuthData.ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
+ AuthData.ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
+
+ mfLastKey = GetCrypto1ProbableKey(&AuthData);
+ PrintAndLog(" | * | key | probable key:%012"PRIx64" Prng:%s ks2:%08x ks3:%08x | |",
+ mfLastKey,
+ validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
+ AuthData.ks2,
+ AuthData.ks3);
+
+ AuthData.first_auth = false;
+
+ traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
+ } else {
+ if (traceCrypto1) {
+ crypto1_destroy(traceCrypto1);
+ traceCrypto1 = NULL;
+ }
+
+ // check last used key
+ if (mfLastKey) {
+ if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize, parity)) {
+ PrintAndLog(" | * | key | last used key:%012"PRIx64" ks2:%08x ks3:%08x | |",
+ mfLastKey,
+ AuthData.ks2,
+ AuthData.ks3);
+
+ traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
+ };
+ }
+
+ // check default keys
+ if (!traceCrypto1) {
+ for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
+ if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize, parity)) {
+ PrintAndLog(" | * | key | default key:%012"PRIx64" ks2:%08x ks3:%08x | |",
+ MifareDefaultKeys[defaultKeyCounter],
+ AuthData.ks2,
+ AuthData.ks3);
+
+ mfLastKey = MifareDefaultKeys[defaultKeyCounter];
+ traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
+ break;
+ };
+ }
+ }
+
+ // nested
+ if (!traceCrypto1 && validate_prng_nonce(AuthData.nt)) {
+ uint32_t ntx = prng_successor(AuthData.nt, 90);
+ for (int i = 0; i < 16383; i++) {
+ ntx = prng_successor(ntx, 1);
+ if (NTParityChk(&AuthData, ntx)){
+
+ uint32_t ks2 = AuthData.ar_enc ^ prng_successor(ntx, 64);
+ uint32_t ks3 = AuthData.at_enc ^ prng_successor(ntx, 96);
+ struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
+ memcpy(mfData, cmd, cmdsize);
+ mf_crypto1_decrypt(pcs, mfData, cmdsize, 0);
+
+ crypto1_destroy(pcs);
+ if (CheckCrypto1Parity(cmd, cmdsize, mfData, parity) && CheckCrc14443(CRC_14443_A, mfData, cmdsize)) {
+ AuthData.ks2 = ks2;
+ AuthData.ks3 = ks3;
+
+ AuthData.nt = ntx;
+ mfLastKey = GetCrypto1ProbableKey(&AuthData);
+ PrintAndLog(" | * | key | nested probable key:%012"PRIx64" ks2:%08x ks3:%08x | |",
+ mfLastKey,
+ AuthData.ks2,
+ AuthData.ks3);
+
+ traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
+ break;
+ }
+ }
+ }
+ }
+
+ //hardnested
+ if (!traceCrypto1) {
+ printf("hardnested not implemented. uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
+ MifareAuthState = masError;
+
+ /* TOO SLOW( needs to have more strong filter. with this filter - aprox 4 mln tests
+ uint32_t t = msclock();
+ uint32_t t1 = t;
+ int n = 0;
+ for (uint32_t i = 0; i < 0xFFFFFFFF; i++) {
+ if (NTParityChk(&AuthData, i)){
+
+ uint32_t ks2 = AuthData.ar_enc ^ prng_successor(i, 64);
+ uint32_t ks3 = AuthData.at_enc ^ prng_successor(i, 96);
+ struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
+
+
+
+
+ n++;
+
+ if (!(n % 100000)) {
+ printf("delta=%d n=%d ks2=%x ks3=%x \n", msclock() - t1 , n, ks2, ks3);
+ t1 = msclock();
+ }
+
+ }
+ }
+ printf("delta=%d n=%d\n", msclock() - t, n);
+ */
+ }
+ }
+
+
+
+ MifareAuthState = masData;
+ }
+
+ if (MifareAuthState == masData && traceCrypto1) {
+ memcpy(mfData, cmd, cmdsize);
+ mf_crypto1_decrypt(traceCrypto1, mfData, cmdsize, 0);
+ *mfDataLen = cmdsize;
+ }
+
+ return *mfDataLen > 0;
+}
+
+bool NTParityChk(TAuthData *ad, uint32_t ntx) {
+ if (
+ (oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) ||
+ (oddparity8(ntx >> 16 & 0xff) ^ (ntx >> 8 & 0x01) ^ ((ad->nt_enc_par >> 6) & 0x01) ^ (ad->nt_enc >> 8 & 0x01)) ||
+ (oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((ad->nt_enc_par >> 7) & 0x01) ^ (ad->nt_enc >> 16 & 0x01))
+ )
+ return false;
+
+ uint32_t ar = prng_successor(ntx, 64);
+ if (
+ (oddparity8(ar >> 8 & 0xff) ^ (ar & 0x01) ^ ((ad->ar_enc_par >> 5) & 0x01) ^ (ad->ar_enc & 0x01)) ||
+ (oddparity8(ar >> 16 & 0xff) ^ (ar >> 8 & 0x01) ^ ((ad->ar_enc_par >> 6) & 0x01) ^ (ad->ar_enc >> 8 & 0x01)) ||
+ (oddparity8(ar >> 24 & 0xff) ^ (ar >> 16 & 0x01) ^ ((ad->ar_enc_par >> 7) & 0x01) ^ (ad->ar_enc >> 16 & 0x01))
+ )
+ return false;
+
+ uint32_t at = prng_successor(ntx, 96);
+ if (
+ (oddparity8(ar & 0xff) ^ (at >> 24 & 0x01) ^ ((ad->ar_enc_par >> 4) & 0x01) ^ (ad->at_enc >> 24 & 0x01)) ||
+ (oddparity8(at >> 8 & 0xff) ^ (at & 0x01) ^ ((ad->at_enc_par >> 5) & 0x01) ^ (ad->at_enc & 0x01)) ||
+ (oddparity8(at >> 16 & 0xff) ^ (at >> 8 & 0x01) ^ ((ad->at_enc_par >> 6) & 0x01) ^ (ad->at_enc >> 8 & 0x01)) ||
+ (oddparity8(at >> 24 & 0xff) ^ (at >> 16 & 0x01) ^ ((ad->at_enc_par >> 7) & 0x01) ^ (ad->at_enc >> 16 & 0x01))
+ )
+ return false;
+
+ return true;
+}
+
+bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize, uint8_t *parity) {
+ uint8_t buf[32] = {0};
+ struct Crypto1State *pcs;
+
+ AuthData.ks2 = 0;
+ AuthData.ks3 = 0;
+
+ pcs = crypto1_create(key);
+ uint32_t nt1 = crypto1_word(pcs, ad->nt_enc ^ ad->uid, 1) ^ ad->nt_enc;
+ uint32_t ar = prng_successor(nt1, 64);
+ uint32_t at = prng_successor(nt1, 96);
+
+ crypto1_word(pcs, ad->nr_enc, 1);
+// uint32_t nr1 = crypto1_word(pcs, ad->nr_enc, 1) ^ ad->nr_enc; // if needs deciphered nr
+ uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ad->ar_enc;
+ uint32_t at1 = crypto1_word(pcs, 0, 0) ^ ad->at_enc;
+
+ if (!(ar == ar1 && at == at1 && NTParityChk(ad, nt1))) {
+ crypto1_destroy(pcs);
+ return false;
+ }
+
+ memcpy(buf, cmd, cmdsize);
+ mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
+
+ crypto1_destroy(pcs);
+
+ if (!CheckCrypto1Parity(cmd, cmdsize, buf, parity))
+ return false;
+
+ if(!CheckCrc14443(CRC_14443_A, buf, cmdsize))
+ return false;
+
+ AuthData.nt = nt1;
+ AuthData.ks2 = AuthData.ar_enc ^ ar;
+ AuthData.ks3 = AuthData.at_enc ^ at;
+
+ return true;
+}
+
+bool CheckCrypto1Parity(uint8_t *cmd_enc, uint8_t cmdsize, uint8_t *cmd, uint8_t *parity_enc) {
+ for (int i = 0; i < cmdsize - 1; i++) {
+ if (oddparity8(cmd[i]) ^ (cmd[i + 1] & 0x01) ^ ((parity_enc[i / 8] >> (7 - i % 8)) & 0x01) ^ (cmd_enc[i + 1] & 0x01))
+ return false;
+ }
+
+ return true;
+}
+
+uint64_t GetCrypto1ProbableKey(TAuthData *ad) {
+ struct Crypto1State *revstate = lfsr_recovery64(ad->ks2, ad->ks3);
+ lfsr_rollback_word(revstate, 0, 0);
+ lfsr_rollback_word(revstate, 0, 0);
+ lfsr_rollback_word(revstate, ad->nr_enc, 1);
+ lfsr_rollback_word(revstate, ad->uid ^ ad->nt, 0);
+
+ uint64_t lfsr = 0;
+ crypto1_get_lfsr(revstate, &lfsr);
+ crypto1_destroy(revstate);
+
+ return lfsr;
+}
projects / proxmark3-svn / blobdiff